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Fire breathing dragons are clearly something from legend, but what about a monster that lives in an ancient deep lake? Sir David Attenborough reflects on a time when pre-eminent conservationist and naturalist Peter Scott was acquiring evidence to prove - or disprove - the existence of the Loch Ness Monster. No such giant creature has ever been found, but this is an intriguing tale of discovery. David moves his story beyond the Scottish Highlands and into the Himalayas - where he reveals something very surprising. Written and presented by David Attenborough. Producer: Julian Hector First broadcast on Â鶹Éç Radio 4 in April 2011.